When we think of bacteria we usually think of something harmful that makes us sick. This is wrong. Most bacteria are not harmful and many bacteria are beneficial. We cannot live without them. There are the bacteria around us and inside us. These are the good bacteria.
Bacteria are among the oldest living things on the Earth. Bacteria have been around for about 4 billion years. This means that bacteria were the dominating life form on Earth for about 3.5 billion years.
Many scientists still believe that bacteria are still the dominant life form. It is estimated that there kg by kg there are more bacteria on the Earth than all other life forms combined. This includes trees and plants animals and humans, insects and fish.
There are bacteria all over the Earth. There are bacteria on land and in water. There are bacteria in the soil and deep underground. There are bacteria flying…
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